Update Kapacitor AST extract handlers to also guard against empty slices
Update Kapacitor AST extract handlers to also guard against empty slices

li-ang/influxdb,nooproblem/influxdb,influxdb/influxdb,influxdata/influxdb,influxdb/influxdb,nooproblem/influxdb,nooproblem/influxdb,nooproblem/influxdb,influxdata/influxdb,influxdb/influxdb,influxdb/influxdb,li-ang/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb